Windshield wiper motor



Sept. 18, 1945. E. KOPPELMAN. 2,385,084

WINDSHIELD` WIPER `MOTOR Filed July 25, 1944 3 SheetS--Sheeil l EDWARD KoPPz-:LMAN

BBM Q6 Gttorneg Sept-18,1945. E. KOPPELMAN 2,385,084

WINDSHIELD WIPER MOTOR Filed July 25, 1944 3 Sheets-Shea?I 2 Snoentor EDWARD KOPPELMAN (-Iftorneg sept. 1s, 194s.

E. KOPPELMAN WIDSHIELD WIPER MOTOR Filed July 25, 1944 3 Sheets-She'et 5l Hf, A-15 l Zhwentor EDWARD KOPPELMAN Cttorneg Fig 15 Patented Sept. 18, 1945 FICEV Y WINosmELD WIrEnMoTon I adware Koppelman, 'Norm noiiywota, calin nppucaucnJuly 25, ioiigpsemlina 546,515

` l Claims. The present invention relates' to -ui'd: operated -motors andmore particularly to motors of this type utilized for actuating windshield wipers.

f One of the requisites for such a 'motor is that rupon being renderedinactive the wiper armt be;-

comes parkedl tnatis, it is moved to mdretained at the end of its stroke; Various means have been. utilized' for accomplishingthe foregoing and an object of the present invention is to provide an' improved means for `acconipliShing such a result. Y

Another object' istoprovide a motor 'wherein the 'complete operating' cycle and parking is controlled by the oscillated valve which is common to this type of motor, and whereinA upon being moved toparking position the oscillatedl valve's rendered inactive or inoperativebut is not arrested. By this arrangement' if the wiper arm is moved, such as when cleaning of the windshield occurs,4 the valve will not be damaged and regardless of what position the wiper arm is in when released the motor will operate to return it to parked position.

Otherobjects will be in part obvious and in part pointed out more in detail' hereinafter.

` The invention accordingly consists in the fenitures of construction, combination orel'elnents, and arrangement of parts which will be exemplilied in the construction hereafter set forthy` and the 'scopeA of the application which will be indicated inthe appended claims.

In the accompanying drawings: Fig; 1 is a plan view of a4 motorgembodying the -invention herein;

' Fig. 2 is a front Aview with casing in section to show the details of construction and with the motor in parked position; Fig. 3 is a view taken on the lineS-S of Fig. 2k; Figs. 4 land 5- are fragmentary views similar to Fig. 2 and showing4 the oscillating valve in its successive positions" during normal operations;`

Fig. '6 is a perspective view of the valveylools ing at the operating face;

Figs. 7 to 9 inclusive are schematic drawings of the oscillating valve showing its various positions:

Fig. 10 is a perspective view lsimilar to Figi` 6 of a modication of the valve shownV in Fig. 6; Fig. 11 is a View similar to Fig. 5 and showing a modied arrangement of parts and another embodiment of the oscillating valve;

Fig.- 12 is a perspective View ofthe valve shown in Fig. 11 looking at thefoperating4 face; and` l Figs. 13 Vto 15 inclusive are schematic drawings of the valve shown in Figs. 11v and 12 showing its various positions;

Referring to thel drawings,- the motor isV genorallys'imilar to that disclosed in Patent` No. 2263,0033 iSSued i' the Sallie' inveliill* ndclnprising a casing A having therein a' reciprocating piston'- B, a valve C? for alternately connecting the opposite ends of thecasing to the source of fluid pressure for operating` the piston, valve actuating means'Diand control means E;

More particularly, the casing A comprises opposed piston chambers il and I2 connected together by complementary front and rear meinbers H and IB. The` front andrear members Il and i6' define therebetween a valve guldewa'y, in whichguideway the; valve C is adapted to be oseill'a'c/tn'iv on the inner face ofV the front member lll, which face constitutes a valve scat '201 vThe valve seat 2o is provided with three ports 22, 24, and 2B. The central port 22- connects through a passage 28l to a passage 3l)` provided in the top wall of thepi'stonchamber lo: the latter passage being open at its outer end and' adapted to be connected? to-a source oflnotlvating fluid such as the suction of' an automobile engine. The right port" Zconnects'thr'ough a passage 32 to a passage 341iv also providedv in-r the topwall of the piston chamber lo and connected at its outer end through an'- opening 36` to the interior of the piston chamber. In like manner, the left port 267 cona nects through a passage 38 to a passage d'0 provided infthe top Wall` olfV the piston chamber I2; the latter passage connecting at its outer end through an opening "finto the piston chamber. Operating -onthe valve seat Y2li and adapted to cooperatewith the ports 22, 24', andv 26to control` the motor its the valve C. details of which will 'behereinafter described. To oscillate the vali/ec` itis provided? with a mounting member H- 'slidable onto the endy of an actuator arm 5U,

. which arm is provided with an opening 52` intermediate'pf' its Vends for pivotallyl mounting same on" the wiper 'actuating shaft 54. As best seen in' Fig. 3,` the shaft 56 is pivotally mounted at its inner end in atitbular bearing 5'6 provided on the: inner' face; of the' rear casing member IB, and the shaft' thenl extends successively through tne'valveactuating armf; a sleeve 58,l and a second sleeve G0 andcarries on its outer end exterioi of the n'iotor-a screw tip 8|y for mounting a wiper armf thereon'. The sleeve 58v isjsecurecl toY theV shaft 5l and has integral therewith a gear segment lil',` which segment is provided .with a pairl orspaced stops Si: audits; As indicated, theV gear segment 62- is secured to the sleeve 158 forwardly of the 'valve actuator 50, and mounted on trie sleeve intermediate cf the valve actuating arm and the gear segment is an actuating spring 68. The spring 68 is formed with a coil 10 for pivotally mounting it on the sleeve 58 and spaced depending arms 12 and 'I4 which extend downwardly and are positioned between spaced ngers 16 and 18 provided on the valve actuating arm 50 beneath the pivot thereof.

For actuating the aforedescribed mechanism, the piston B comprises a pair of spaced piston members-80` and 82. each having.;- a fluidand air-tighty in :their :'respeotivef chambers "and inter-connected by a rack member 84. The rack member 84 is provided with spaced teeth 86 meshing with teeth 88 of the gear segment 62,

whereby upon reciprocating motion of the piston with this movement, the slot |06 is arranged at an acute angle to the longitudinal axis, whereby it will cam the nger |04 to the right, simultaneously sliding the lever 98 to the right to move the stop 96 closer to the iixed stop 94.

operategthewipen arm carriedrth'ereby. However,

when the trigger |08 is pushed inwardly, the stop 96 will be moved to the position shown in Fig. 2

the gear will be oscillated toy oscillate theshaft 54. In turn, when the gear segment is oscillated,

the spaced stops 64 and 66 willlalterna'tely en gage the spaced legs of the spring 68 to place same under tension and oscillate the"valve;

Whenitis desirable to prevent operation ofrthe valve CV untilgthe. piston has completed a vpredetermined stroke; there is carried by the piston a holding memberg whichgreciprocates therewith and moves-ina Jpath intersecting `a restrain- 50 beneath the pivot of the latter,V

With this construction, whenthevalVe-is in the position shown in Fig, '1L-ther restraining member'92 will be just beneath the holding member', 90, where, upon 'movementrofvthe piston to theleft, theholding members-willmoveover and acrossthe restraining member 92.1 Simultaneously, the pin 66 will likewise be oscillated until to pivot.- Upon pivoting,the valvew-illithen as'- sumey a positonwherein the restraining. member 92 is just slightly above-thezj holding member .90, and. the latter, will, Pegs, under Seme during .the reverse travel. v l Y' The movement of valve C @is controlled by 'Acontrol'meansfE whichl meansv include a stop 96 adapte'dlto ccoperate.with a stop 94 to'flimit movementl `of the valve.l n @The stopl 94 is fixed tofthe rearcasing member I6; .whereas the stop 96is .carried on the innerendof ahorizontally arrangedlever 98. The inner portion of the lever 98 is slidably mounted in a guide |00 provided inthe rear.. casing. member. |6. and the v outerJend extends through an opening |02 just abovethe top `Wall' of .the piston chamber I0. AtY its-wouter end the lever 98 is turned upwardly to vprovide a finger |04 receivable Within a slot |06I cut in a trigger vmember |08.- The trigger member is further provided with a second slot I|0 which is parallel to lthe `longitudinal axis thereof and permits the mounting-oi vthe trigger member over a square stud ||2`` secured on the top wall ofz'the piston chamber|0. To vhold .the trigger memberin place, there 'is also provided a top plate |'I4f overlying the triggerfm'emberand secured'to the stud I2 by a screw'lvll. As seen in Fig. 1 .the slot |`|0 is of greater length than the stuygV H2, `wli'e'rebyuponpulling of the, handle I8` of the, trigger memberthe lat-termay': be moved forwardly.M'Toccoperate ing'member 92 .carried by. thevalve actuatingarm.

and the valve will assume the position shown therein,whereupon operation of the motor will cease upon the vwiper reaching parked position.

To hold the trigger |06 in either its operative or inoperative position, there is located beneath same a spring plate |20 having a detent |2| on its upper face receivable within openings |22 provided -in'the'trigger memb'erl08.

With the exception-of .valve means C and the positioning of ports 22', 24 'and` 26 the structure describedis similar to and functions in like manner to that disclosed in the aforementioned patent. Howeveryin theupresent instancewhen the Valve C moves toitsinactive positionvacuum is maintained in the last operative connected chamber thus-retaining the wiper in parked position. To accomplish theoregoing the valve C has a face 45, adapted to ride on seat 20, thel face beingprovided vwith a pluralityof flow and escape channelsf-or controlling the fluid ow, the flowbhannels being so arranged that regardless of thepositionof valve C the centraland one side jport vare]incommunication yand the lescape `channelsso-arranged thatl the port not in communication will be Vented to atmosphere when Vthe valvenis in a position overlying same.A More speciiically the ilowY channels are formed by recessing the valve below the plane ofthe face 45 .thereof to provide a central valve chamber 4T and auxiliary valve chambers 49 and 5| spaced laterallyf from themain 'chamber andA connected theretoby passages 53 and 63.- VTheescape channels are formed. by recess ing the face of the valve tok provide passagesrandv 5 11which open to atmospher'egwhen valve'C rests on seat 20.

As best seen inF'g. 6 thevalve C issymmetrical ,tol each side,- of. avertical `center `line whereby the valve may be utilized on; either .a right or left hand motor. y,

.-Withthe foregoing arrangement when the valve is in the inactive position shownfinrEigs. 1 2 and 7 themotor is parked Ywith port 22 and chamber .port24 in communication through passage 63 and passage port 26 vented to atmosphere through escape passage 51. Uponinoving the control means forward stop ,9 6 -willlmoveto the right carrying valve C with itjand the partswill be positioned as s hownin Figs.. land 8. The valve is now. inoperating position with :suction port 20 in communication' with chamber port 2,6 whereas chamber port 24 is vented to atmosphere through escape passage 55. The, motorv will nowfoperate with the piston moving to thegleft.A Upon completing its stroke'valve '.Cwill :be oscillated tothe position s'hownin Figs. 5 Aand Q .Whereupon the: fluid con- `nectior'is are again reversed'.

A e valve is .nowv inltheffalternateoperating position with suction port 22'and chamberport 24 again in' .communication through chamber y 41 whereas l'pfort 26 is ventedto atmosphere.v As long `as -stop y96'rernains unchanged themotcr willcontinue to operate 'and the valve 'shifted'b'etweelits alternate operative positions. Howeverfupon returning stopf Seto its inactive positionyth'e motor will be brought to a1 stop. It will be noted: that when the valve moves to the position of- Fig. 9I the pistonV will' as usual complete its-stroke to-the right andthereafter upon-the valve moving to the position of Fig. 7 communication momentarily-broken and then reestablished between suction. port Z2 andi the last connected chamber port 24to maintainthe motor inl parked position. Y

Referring now to Fig. 1'0 there is shown a modified valve diifering from that of Fig. 6 in that the escape channels" and 5ft extend through the valve body and connecting 'passages 53" uand 63'u arelocvated over rather than below the passages. f Y Y f f Referring V4now tothe embodiment illustrated in Figs. 1'1 to 15 corresponding partslhavelbeen given corresponding numbers.` It will be noted, however, Vthat the suction and side ports 22', 24

and 26 arev arranged in verticall'alignment. I'o

cooperate therewith, the valve has' aA face |45 adapted to ride on the valve seat and is recessed to l'form the flow channels for making the necessary llid connections. V "Ihe'ilowchannels herein also includea main chamber |41, auxiliary chamber |53 andspaced auxiliary chamber |63 connected to the main chamber; With Athis arrangement when stop 96 is in the overthrow position the valve willibe positioned as shown in Fig. 13 "with the center portl'iZZ rconnectedA to side port 24. Upon shifting tothe first operative position (Figlll) the center port-2l becomes connected withside port 26 whereupon operation starts. When the valve oscillates tothe positionshown in Fig. 15, center port 22 is again connected to side port 24 but through the opposite auxiliary chamber |163. So long as stop 96 remains in the on position shown in Figs. 14 and 15, the valvewillV oscillate between its operative position. However, when stop 96v is Vmoved to its inactive or off position valve C will move tothe overthrow or -inactive position resulting in stopping of the motor and parking g of the wiperv arm.

From the foregoing, it will be seen that parking is accomplished by moving the valve to a p0- sition where it is rendered inactive or inoperative without arresting it or restricting it against movement. This also results in the motor stopping and, upon moving the valve to the first operative position, automatic starting of the motor occurs.

As many changes could be made in the above construction and many apparently widely dilerent embodiments of this invention could be made without departing from the scope thereof, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

It is also to be understood that the language used in the following claims is intended to cover all of the generic and speciiic features of the invention herein described and all statements of the scope of the invention which, as a matter of language, might be said to fall therebetween.

I claim as my invention:

1. In combination with a motor including a Valve seat having a central and side ports with means for oscillating a valve on said seat between alternate operative positions and to an inactive position, a valve provided with ilow channels for connecting said central port with a side port when in alternate operative positions and diierent ow channels ffo'r: connecting .the centrar port. withi a side port when in inactive positionl i A2; Irl-combination with a motor including a valvesseat. lhaving a central and side: ports with meanslfor oscillating a valveion-said seatbetween alternateoperative 'positions and to' arr inactive position, a valveprovided with flow channels for connecting said central port witha `side port when in alternate operative positions,- ydifferent flow channels for connecting the central port with a side portwhen'in inactive positionv and escape channels alignable'with aside port when the valve overlaps same( l Y 3; Incornbination with a motor including a valver-'seat-havinga central' and sidegport's with means for' oscillating a valve on said seat between alternate operative positions andl to an inactive positionne valvefprovided with flowlhannels for maintaining one sideV port -in fluid communica tion with the central port in any positiono the valvefand escape channels for venting the side port 'not in communication withv t'hecentral port when the valve straddles such' port. 411m' combination with a"motorincluding a valve seat having a centraliand sidepo'rts: with means for oscillating a valve'on said seatbetween alternate operative positions and to an inactive position, a valve provided' with new passagesy for connecting. the central port with the first side port wioenjin inactive position, different flow passages for connecting the central port and the' second side portjwhen the, valve is in one operative position' and still other flow passages forconnecting the rst side port with the central port 'when the Valve is in itslalternate operative position.

.5. In combination withv a motor including a valve seat having a vcentral andside ports with means for oscillating a valveA onsai seat between alternate operative positions and'to an inactive position, a valve provided with flow passages for connectingfthe centralV port with Ythe first side `portwhen in inactive position, diierer'it flow passagesfor connecting.the` central port and the second side port when the valve is in one` op'- erativeposition and still other flow passages for connecting the first side port with the central port whenthe valve is in its alternate operative position, and escape passages for Venting the second side port to atmosphere when the valve is in inactive position and for venting rst side port to atmosphere when the valve is in its rst operative position.

6. In combination with a motor including a Valve seat having a central and side ports with means for oscillating a valve 011 said seat between alternate operative positions and to an inactive position, a valve movable on the seat, said valve being provided with a central chamber and auxiliary chambers located to either side thereof and connected by passages thereto whereby said center port will be connected to one of the side ports in any position of the valve.

7. In combination with a motor including a valve seat having a suction port and side ports with means for oscillating a valve on said seat between alternate operative positions and an inactive position, a valve provided with now channels therein for connecting the suction port with one of the side ports when the valve is in inactive or one operative position and for connecting the suction port with the other chamber port when the valve is in its other operative position.

8. In combination with a motor including a valve seat having a suction port and side ports with means for oscillating a valve on said seat to threediiferent positions, a valve movable on said seat, said valve lbeing-provided with now channels forv connecting one of said side ports with central port in either of two positions of the valve and for connecting the central port with one of said ports in a third position of the valve. p 9. In a motor of the character described, a valverseat having a center port and spaced side ports, avvalve movable on said valve seat between two operative positions and to a third inoperative position, said valve including flow channels for connecting said centerport with one of the side ports in any position of the valve.

10.V In a motor of the character described, a valve seat having a central port and spaced side ports, a valve movable on said valve seat between two operative positions and to a third inoperative position, said valve having now channels for connecting the same said side port with the center port in one operative position and the inoperative position of the valve, and other flow channels for connecting the other side port with the central port in the other operative position of the valve.

11. In a motor of the character described, a valve seat having a center and spaced side ports arranged in vertical alignment, a valve movable on said valve seat between two operative positions and'to an inactive position, said valve having now channels for connecting the same side port with the center port in one operative position and the inactive position of the valve, and other flow channels for connecting thev other side port with the central port in the other operative position of the valve.

12. In a motor of the character described, a valve seat having a center and spaced side ports, a valve movable on said valve seat between two operative positions and to an inactive position, said Yvalve having iiow channels for connecting the same side port with the center port in one operative position and the inactive position of the valve, and other flow channels for connecting the other sidel port with the central portin the other operative position of the valve.

' 13. In a motor of the character described, a

casing, a piston operable within the casing, said casing including a suction passage and separate passages, one leading to each end of the piston, a valve movable between two operative positions whereby it will alternately connect the suction passage with one of the other passages and to an inactive position where it connects one of the passages to the suction passage, means normally limiting the movement of the valve to the position where it alternately connects the suction passage with one of the other passages, said means being adjustable to permit the valve to move to said inactive position, and means operable by the piston for moving said valve to any of said positions.

14. In a motor of the character described, a casing having a valve seat provided with a center and spaced side ports, a valve movable on the seat to three positions, said valve having a main chamber and spaced auxiliary chambers communicating with the main chamber, said ports and chambers being so positioned that said center port communicates with the main chamber in all positions of the valve and one only of the side ports communicates with the main chamber through an auxiliary chamber in any position of the valve.

15. In a motor of the character described, a casing having. a valve seat provided with a center portrand a pair of spaced side ports, a valve movable on said seat to three positions, said valve including a main chamber and spaced auxiliary chambers communicating with the main chamber, said ports and chambers being so positioned that the main chamber communicates with the center port in all positions of the valve, one side portY communicates with the main chamber through an auxiliary chamber in two positions of the valve and is out vof communication in the third positionV and the other side port communicate with the main chamber through an auxiliary chamber in the third position of the valve and is out of communication in the other two positions.

EDWARD KOPPELMAN. 

